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Exhaust flaps cost 60$
30$ piece on amazon and 30$ app called BimmerLink and about 3 minutes of your time. Best mod I've done yet.
As for butt dyno I've driven the car 100 miles since and in a lot of traffic and I did the exhaust the same day. I also only had the car for a week before doing it so I can't be a good judge. All I know is the car is a BEAST.
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